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/**
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* '$RCSfile$'
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* Purpose: A Class that represents a structured query, and can be
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* constructed from an XML serialization conforming to
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* pathquery.dtd. The printSQL() method can be used to print
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* a SQL serialization of the query.
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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* Release: @release@
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*
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.*;
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import java.util.Stack;
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import java.util.Vector;
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import java.util.Enumeration;
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import org.xml.sax.Attributes;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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import org.xml.sax.XMLReader;
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import org.xml.sax.helpers.XMLReaderFactory;
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import org.xml.sax.helpers.DefaultHandler;
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/**
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* A Class that represents a structured query, and can be
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* constructed from an XML serialization conforming to @see pathquery.dtd.
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* The printSQL() method can be used to print a SQL serialization of the query.
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*/
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public class QuerySpecification extends DefaultHandler {
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private boolean containsExtendedSQL=false;
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// Query data structures
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private String meta_file_id;
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private String querytitle;
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private Vector doctypeList;
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private Vector returnFieldList;
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private Vector ownerList;
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private Vector siteList;
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private QueryGroup query = null;
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private Stack elementStack;
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private Stack queryStack;
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private String currentValue;
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private String currentPathexpr;
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private String parserName = null;
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private String accNumberSeparator = null;
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/**
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* construct an instance of the QuerySpecification class
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*
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* @param queryspec the XML representation of the query (should conform
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* to pathquery.dtd) as a Reader
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* @param parserName the fully qualified name of a Java Class implementing
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* the org.xml.sax.XMLReader interface
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*/
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public QuerySpecification( Reader queryspec, String parserName,
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String accNumberSeparator ) throws IOException {
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super();
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// Initialize the class variables
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doctypeList = new Vector();
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elementStack = new Stack();
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queryStack = new Stack();
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returnFieldList = new Vector();
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ownerList = new Vector();
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siteList = new Vector();
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this.parserName = parserName;
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this.accNumberSeparator = accNumberSeparator;
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// Initialize the parser and read the queryspec
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XMLReader parser = initializeParser();
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if (parser == null) {
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System.err.println("SAX parser not instantiated properly.");
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}
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try {
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parser.parse(new InputSource(queryspec));
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} catch (SAXException e) {
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System.err.println("error parsing data in " +
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"QuerySpecification.QuerySpecification");
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System.err.println(e.getMessage());
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}
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}
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/**
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* construct an instance of the QuerySpecification class
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*
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* @param queryspec the XML representation of the query (should conform
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* to pathquery.dtd) as a String
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* @param parserName the fully qualified name of a Java Class implementing
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* the org.xml.sax.Parser interface
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*/
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public QuerySpecification( String queryspec, String parserName,
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String accNumberSeparator) throws IOException {
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this(new StringReader(queryspec), parserName, accNumberSeparator);
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}
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/** Main routine for testing */
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static public void main(String[] args) {
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if (args.length < 1) {
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java QuerySpecification <xmlfile>");
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return;
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} else {
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String xmlfile = args[0];
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try {
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MetaCatUtil util = new MetaCatUtil();
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FileReader xml = new FileReader(new File(xmlfile));
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QuerySpecification qspec =
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new QuerySpecification(xml, util.getOption("saxparser"),
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util.getOption("accNumberSeparator"));
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System.out.println(qspec.printSQL());
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} catch (IOException e) {
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System.err.println(e.getMessage());
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}
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}
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}
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berkley
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/**
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* Returns true if the parsed query contains and extended xml query
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* (i.e. there is at least one <returnfield> in the pathquery document)
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*/
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public boolean containsExtendedSQL()
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{
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if(containsExtendedSQL)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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/**
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* Accessor method to return a vector of the extended return fields as
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* defined in the <returnfield> tag in the pathquery dtd.
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*/
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public Vector getReturnFieldList()
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{
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return this.returnFieldList;
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}
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172
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jones
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/**
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* Set up the SAX parser for reading the XML serialized query
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*/
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185
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private XMLReader initializeParser() {
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XMLReader parser = null;
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172
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jones
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// Set up the SAX document handlers for parsing
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try {
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// Get an instance of the parser
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185
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parser = XMLReaderFactory.createXMLReader(parserName);
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185
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// Set the ContentHandler to this instance
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parser.setContentHandler(this);
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185
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// Set the error Handler to this instance
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158
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parser.setErrorHandler(this);
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155
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} catch (Exception e) {
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675
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berkley
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System.err.println("Error in QuerySpcecification.initializeParser " +
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| 190 |
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e.toString());
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155
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}
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| 192 |
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| 193 |
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return parser;
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}
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172
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jones
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/**
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* callback method used by the SAX Parser when the start tag of an
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| 198 |
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* element is detected. Used in this context to parse and store
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| 199 |
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* the query information in class variables.
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*/
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185
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public void startElement (String uri, String localName,
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String qName, Attributes atts)
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| 203 |
155
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jones
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throws SAXException {
|
| 204 |
185
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jones
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BasicNode currentNode = new BasicNode(localName);
|
| 205 |
159
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jones
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// add attributes to BasicNode here
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| 206 |
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if (atts != null) {
|
| 207 |
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int len = atts.getLength();
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| 208 |
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for (int i = 0; i < len; i++) {
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| 209 |
185
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jones
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currentNode.setAttribute(atts.getLocalName(i), atts.getValue(i));
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159
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jones
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}
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| 211 |
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}
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| 212 |
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158
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jones
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elementStack.push(currentNode);
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159
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jones
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if (currentNode.getTagName().equals("querygroup")) {
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| 215 |
158
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jones
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QueryGroup currentGroup = new QueryGroup(
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| 216 |
178
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jones
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currentNode.getAttribute("operator"));
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| 217 |
158
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jones
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if (query == null) {
|
| 218 |
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query = currentGroup;
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| 219 |
159
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jones
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} else {
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| 220 |
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QueryGroup parentGroup = (QueryGroup)queryStack.peek();
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| 221 |
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parentGroup.addChild(currentGroup);
|
| 222 |
158
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jones
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}
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| 223 |
159
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jones
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queryStack.push(currentGroup);
|
| 224 |
158
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jones
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}
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| 225 |
155
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jones
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}
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| 226 |
|
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| 227 |
172
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jones
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/**
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| 228 |
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* callback method used by the SAX Parser when the end tag of an
|
| 229 |
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* element is detected. Used in this context to parse and store
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| 230 |
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* the query information in class variables.
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| 231 |
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*/
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| 232 |
185
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jones
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public void endElement (String uri, String localName,
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| 233 |
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String qName) throws SAXException {
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| 234 |
158
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jones
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BasicNode leaving = (BasicNode)elementStack.pop();
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| 235 |
159
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jones
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if (leaving.getTagName().equals("queryterm")) {
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| 236 |
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boolean isCaseSensitive = (new Boolean(
|
| 237 |
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leaving.getAttribute("casesensitive"))).booleanValue();
|
| 238 |
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QueryTerm currentTerm = null;
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| 239 |
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if (currentPathexpr == null) {
|
| 240 |
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currentTerm = new QueryTerm(isCaseSensitive,
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| 241 |
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leaving.getAttribute("searchmode"),currentValue);
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| 242 |
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} else {
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| 243 |
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currentTerm = new QueryTerm(isCaseSensitive,
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| 244 |
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leaving.getAttribute("searchmode"),currentValue,
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| 245 |
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currentPathexpr);
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| 246 |
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}
|
| 247 |
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QueryGroup currentGroup = (QueryGroup)queryStack.peek();
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| 248 |
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currentGroup.addChild(currentTerm);
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| 249 |
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currentValue = null;
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| 250 |
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currentPathexpr = null;
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| 251 |
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} else if (leaving.getTagName().equals("querygroup")) {
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| 252 |
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QueryGroup leavingGroup = (QueryGroup)queryStack.pop();
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| 253 |
158
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jones
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}
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| 254 |
155
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jones
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}
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| 255 |
158
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jones
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| 256 |
172
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jones
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/**
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| 257 |
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* callback method used by the SAX Parser when the text sequences of an
|
| 258 |
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* xml stream are detected. Used in this context to parse and store
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| 259 |
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* the query information in class variables.
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| 260 |
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*/
|
| 261 |
158
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jones
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public void characters(char ch[], int start, int length) {
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| 262 |
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| 263 |
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String inputString = new String(ch, start, length);
|
| 264 |
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BasicNode currentNode = (BasicNode)elementStack.peek();
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| 265 |
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String currentTag = currentNode.getTagName();
|
| 266 |
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if (currentTag.equals("meta_file_id")) {
|
| 267 |
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meta_file_id = inputString;
|
| 268 |
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} else if (currentTag.equals("querytitle")) {
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| 269 |
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querytitle = inputString;
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| 270 |
159
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jones
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} else if (currentTag.equals("value")) {
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| 271 |
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currentValue = inputString;
|
| 272 |
|
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} else if (currentTag.equals("pathexpr")) {
|
| 273 |
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currentPathexpr = inputString;
|
| 274 |
172
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jones
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} else if (currentTag.equals("returndoctype")) {
|
| 275 |
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doctypeList.add(inputString);
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| 276 |
402
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berkley
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} else if (currentTag.equals("returnfield")) {
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| 277 |
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returnFieldList.add(inputString);
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| 278 |
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containsExtendedSQL = true;
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| 279 |
535
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} else if (currentTag.equals("owner")) {
|
| 280 |
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ownerList.add(inputString);
|
| 281 |
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} else if (currentTag.equals("site")) {
|
| 282 |
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siteList.add(inputString);
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| 283 |
158
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}
|
| 284 |
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}
|
| 285 |
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| 286 |
172
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jones
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|
| 287 |
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/**
|
| 288 |
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* create a SQL serialization of the query that this instance represents
|
| 289 |
|
|
*/
|
| 290 |
|
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public String printSQL() {
|
| 291 |
170
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jones
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StringBuffer self = new StringBuffer();
|
| 292 |
|
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| 293 |
402
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berkley
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self.append("SELECT docid,docname,doctype,doctitle,");
|
| 294 |
626
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berkley
|
self.append("date_created, date_updated, rev ");
|
| 295 |
172
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jones
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self.append("FROM xml_documents WHERE docid IN (");
|
| 296 |
170
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jones
|
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| 297 |
178
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jones
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// This determines the documents that meet the query conditions
|
| 298 |
172
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jones
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self.append(query.printSQL());
|
| 299 |
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| 300 |
|
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self.append(") ");
|
| 301 |
402
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berkley
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|
| 302 |
172
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jones
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// Add SQL to filter for doctypes requested in the query
|
| 303 |
535
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jones
|
// This is an implicit OR for the list of doctypes
|
| 304 |
172
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jones
|
if (!doctypeList.isEmpty()) {
|
| 305 |
|
|
boolean firstdoctype = true;
|
| 306 |
|
|
self.append(" AND (");
|
| 307 |
|
|
Enumeration en = doctypeList.elements();
|
| 308 |
|
|
while (en.hasMoreElements()) {
|
| 309 |
|
|
String currentDoctype = (String)en.nextElement();
|
| 310 |
|
|
if (firstdoctype) {
|
| 311 |
402
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berkley
|
firstdoctype = false;
|
| 312 |
|
|
self.append(" doctype = '" + currentDoctype + "'");
|
| 313 |
172
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jones
|
} else {
|
| 314 |
|
|
self.append(" OR doctype = '" + currentDoctype + "'");
|
| 315 |
|
|
}
|
| 316 |
|
|
}
|
| 317 |
|
|
self.append(") ");
|
| 318 |
|
|
}
|
| 319 |
402
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berkley
|
|
| 320 |
535
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jones
|
// Add SQL to filter for owners requested in the query
|
| 321 |
|
|
// This is an implicit OR for the list of owners
|
| 322 |
|
|
if (!ownerList.isEmpty()) {
|
| 323 |
|
|
boolean first = true;
|
| 324 |
|
|
self.append(" AND (");
|
| 325 |
|
|
Enumeration en = ownerList.elements();
|
| 326 |
|
|
while (en.hasMoreElements()) {
|
| 327 |
|
|
String current = (String)en.nextElement();
|
| 328 |
|
|
if (first) {
|
| 329 |
|
|
first = false;
|
| 330 |
|
|
self.append(" user_owner = '" + current + "'");
|
| 331 |
|
|
} else {
|
| 332 |
|
|
self.append(" OR user_owner = '" + current + "'");
|
| 333 |
|
|
}
|
| 334 |
|
|
}
|
| 335 |
|
|
self.append(") ");
|
| 336 |
|
|
}
|
| 337 |
|
|
|
| 338 |
|
|
// Add SQL to filter for sites requested in the query
|
| 339 |
|
|
// This is an implicit OR for the list of sites
|
| 340 |
|
|
if (!siteList.isEmpty()) {
|
| 341 |
|
|
boolean first = true;
|
| 342 |
|
|
self.append(" AND (");
|
| 343 |
|
|
Enumeration en = siteList.elements();
|
| 344 |
|
|
while (en.hasMoreElements()) {
|
| 345 |
|
|
String current = (String)en.nextElement();
|
| 346 |
|
|
if (first) {
|
| 347 |
|
|
first = false;
|
| 348 |
|
|
self.append(" SUBSTR(docid, 1, INSTR(docid, '" +
|
| 349 |
|
|
accNumberSeparator + "')-1) = '" + current + "'");
|
| 350 |
|
|
} else {
|
| 351 |
|
|
self.append(" OR SUBSTR(docid, 1, INSTR(docid, '" +
|
| 352 |
|
|
accNumberSeparator + "')-1) = '" + current + "'");
|
| 353 |
|
|
}
|
| 354 |
|
|
}
|
| 355 |
|
|
self.append(") ");
|
| 356 |
|
|
}
|
| 357 |
|
|
|
| 358 |
170
|
jones
|
return self.toString();
|
| 359 |
|
|
}
|
| 360 |
402
|
berkley
|
|
| 361 |
|
|
/**
|
| 362 |
|
|
* This method prints sql based upon the <returnfield> tag in the
|
| 363 |
|
|
* pathquery document. This allows for customization of the
|
| 364 |
|
|
* returned fields
|
| 365 |
465
|
berkley
|
* @param doclist the list of document ids to search by
|
| 366 |
402
|
berkley
|
*/
|
| 367 |
465
|
berkley
|
public String printExtendedSQL(String doclist)
|
| 368 |
402
|
berkley
|
{
|
| 369 |
|
|
StringBuffer self = new StringBuffer();
|
| 370 |
423
|
berkley
|
self.append("select xml_nodes.docid, xml_index.path, xml_nodes.nodedata ");
|
| 371 |
|
|
self.append("from xml_index, xml_nodes where xml_index.nodeid=");
|
| 372 |
|
|
self.append("xml_nodes.parentnodeid and (xml_index.path like '");
|
| 373 |
402
|
berkley
|
boolean firstfield = true;
|
| 374 |
|
|
//put the returnfields into the query
|
| 375 |
|
|
//the for loop allows for multiple fields
|
| 376 |
|
|
for(int i=0; i<returnFieldList.size(); i++)
|
| 377 |
|
|
{
|
| 378 |
|
|
if(firstfield)
|
| 379 |
|
|
{
|
| 380 |
|
|
firstfield = false;
|
| 381 |
405
|
berkley
|
self.append((String)returnFieldList.elementAt(i));
|
| 382 |
402
|
berkley
|
self.append("' ");
|
| 383 |
|
|
}
|
| 384 |
|
|
else
|
| 385 |
|
|
{
|
| 386 |
423
|
berkley
|
self.append("or xml_index.path like '");
|
| 387 |
405
|
berkley
|
self.append((String)returnFieldList.elementAt(i));
|
| 388 |
402
|
berkley
|
self.append("' ");
|
| 389 |
|
|
}
|
| 390 |
|
|
}
|
| 391 |
423
|
berkley
|
self.append(") AND xml_nodes.docid in (");
|
| 392 |
465
|
berkley
|
//self.append(query.printSQL());
|
| 393 |
|
|
self.append(doclist);
|
| 394 |
402
|
berkley
|
self.append(")");
|
| 395 |
423
|
berkley
|
self.append(" AND xml_nodes.nodetype = 'TEXT'");
|
| 396 |
405
|
berkley
|
|
| 397 |
423
|
berkley
|
//System.out.println(self.toString());
|
| 398 |
402
|
berkley
|
return self.toString();
|
| 399 |
|
|
}
|
| 400 |
465
|
berkley
|
|
| 401 |
|
|
public static String printRelationSQL(String docid)
|
| 402 |
|
|
{
|
| 403 |
|
|
StringBuffer self = new StringBuffer();
|
| 404 |
489
|
berkley
|
self.append("select subject, relationship, object, subdoctype, ");
|
| 405 |
|
|
self.append("objdoctype from xml_relation ");
|
| 406 |
465
|
berkley
|
self.append("where subject like '").append(docid).append("'");
|
| 407 |
|
|
return self.toString();
|
| 408 |
|
|
}
|
| 409 |
453
|
berkley
|
|
| 410 |
172
|
jones
|
/**
|
| 411 |
465
|
berkley
|
* Prints sql that returns all relations in the database.
|
| 412 |
453
|
berkley
|
*/
|
| 413 |
|
|
public static String printPackageSQL()
|
| 414 |
|
|
{
|
| 415 |
|
|
StringBuffer self = new StringBuffer();
|
| 416 |
|
|
self.append("select z.nodedata, x.nodedata, y.nodedata from ");
|
| 417 |
|
|
self.append("(select nodeid, parentnodeid from xml_index where path like ");
|
| 418 |
|
|
self.append("'package/relation/subject') s, (select nodeid, parentnodeid ");
|
| 419 |
|
|
self.append("from xml_index where path like ");
|
| 420 |
|
|
self.append("'package/relation/relationship') rel, ");
|
| 421 |
|
|
self.append("(select nodeid, parentnodeid from xml_index where path like ");
|
| 422 |
|
|
self.append("'package/relation/object') o, ");
|
| 423 |
|
|
self.append("xml_nodes x, xml_nodes y, xml_nodes z ");
|
| 424 |
|
|
self.append("where s.parentnodeid = rel.parentnodeid ");
|
| 425 |
|
|
self.append("and rel.parentnodeid = o.parentnodeid ");
|
| 426 |
|
|
self.append("and x.parentnodeid in rel.nodeid ");
|
| 427 |
|
|
self.append("and y.parentnodeid in o.nodeid ");
|
| 428 |
|
|
self.append("and z.parentnodeid in s.nodeid ");
|
| 429 |
|
|
//self.append("and z.nodedata like '%");
|
| 430 |
|
|
//self.append(docid);
|
| 431 |
|
|
//self.append("%'");
|
| 432 |
|
|
return self.toString();
|
| 433 |
|
|
}
|
| 434 |
|
|
|
| 435 |
|
|
/**
|
| 436 |
465
|
berkley
|
* Prints sql that returns all relations in the database that were input
|
| 437 |
|
|
* under a specific docid
|
| 438 |
|
|
* @param docid the docid to search for.
|
| 439 |
|
|
*/
|
| 440 |
|
|
public static String printPackageSQL(String docid)
|
| 441 |
|
|
{
|
| 442 |
|
|
StringBuffer self = new StringBuffer();
|
| 443 |
|
|
self.append("select z.nodedata, x.nodedata, y.nodedata from ");
|
| 444 |
|
|
self.append("(select nodeid, parentnodeid from xml_index where path like ");
|
| 445 |
|
|
self.append("'package/relation/subject') s, (select nodeid, parentnodeid ");
|
| 446 |
|
|
self.append("from xml_index where path like ");
|
| 447 |
|
|
self.append("'package/relation/relationship') rel, ");
|
| 448 |
|
|
self.append("(select nodeid, parentnodeid from xml_index where path like ");
|
| 449 |
|
|
self.append("'package/relation/object') o, ");
|
| 450 |
|
|
self.append("xml_nodes x, xml_nodes y, xml_nodes z ");
|
| 451 |
|
|
self.append("where s.parentnodeid = rel.parentnodeid ");
|
| 452 |
|
|
self.append("and rel.parentnodeid = o.parentnodeid ");
|
| 453 |
|
|
self.append("and x.parentnodeid in rel.nodeid ");
|
| 454 |
|
|
self.append("and y.parentnodeid in o.nodeid ");
|
| 455 |
|
|
self.append("and z.parentnodeid in s.nodeid ");
|
| 456 |
|
|
self.append("and z.docid like '").append(docid).append("'");
|
| 457 |
|
|
|
| 458 |
|
|
return self.toString();
|
| 459 |
|
|
}
|
| 460 |
|
|
|
| 461 |
|
|
/**
|
| 462 |
|
|
* Returns all of the relations that has a certain docid in the subject
|
| 463 |
|
|
* or the object.
|
| 464 |
|
|
*
|
| 465 |
|
|
* @param docid the docid to search for
|
| 466 |
|
|
*/
|
| 467 |
|
|
public static String printPackageSQL(String subDocidURL, String objDocidURL)
|
| 468 |
|
|
{
|
| 469 |
|
|
StringBuffer self = new StringBuffer();
|
| 470 |
|
|
self.append("select z.nodedata, x.nodedata, y.nodedata from ");
|
| 471 |
|
|
self.append("(select nodeid, parentnodeid from xml_index where path like ");
|
| 472 |
|
|
self.append("'package/relation/subject') s, (select nodeid, parentnodeid ");
|
| 473 |
|
|
self.append("from xml_index where path like ");
|
| 474 |
|
|
self.append("'package/relation/relationship') rel, ");
|
| 475 |
|
|
self.append("(select nodeid, parentnodeid from xml_index where path like ");
|
| 476 |
|
|
self.append("'package/relation/object') o, ");
|
| 477 |
|
|
self.append("xml_nodes x, xml_nodes y, xml_nodes z ");
|
| 478 |
|
|
self.append("where s.parentnodeid = rel.parentnodeid ");
|
| 479 |
|
|
self.append("and rel.parentnodeid = o.parentnodeid ");
|
| 480 |
|
|
self.append("and x.parentnodeid in rel.nodeid ");
|
| 481 |
|
|
self.append("and y.parentnodeid in o.nodeid ");
|
| 482 |
|
|
self.append("and z.parentnodeid in s.nodeid ");
|
| 483 |
|
|
self.append("and (z.nodedata like '");
|
| 484 |
|
|
self.append(subDocidURL);
|
| 485 |
|
|
self.append("' or y.nodedata like '");
|
| 486 |
|
|
self.append(objDocidURL);
|
| 487 |
|
|
self.append("')");
|
| 488 |
|
|
return self.toString();
|
| 489 |
|
|
}
|
| 490 |
|
|
|
| 491 |
|
|
public static String printGetDocByDoctypeSQL(String docid)
|
| 492 |
|
|
{
|
| 493 |
|
|
StringBuffer self = new StringBuffer();
|
| 494 |
|
|
|
| 495 |
|
|
self.append("SELECT docid,docname,doctype,doctitle,");
|
| 496 |
|
|
self.append("date_created, date_updated ");
|
| 497 |
|
|
self.append("FROM xml_documents WHERE docid IN (");
|
| 498 |
|
|
self.append(docid).append(")");
|
| 499 |
|
|
return self.toString();
|
| 500 |
|
|
}
|
| 501 |
|
|
|
| 502 |
|
|
/**
|
| 503 |
172
|
jones
|
* create a String description of the query that this instance represents.
|
| 504 |
|
|
* This should become a way to get the XML serialization of the query.
|
| 505 |
|
|
*/
|
| 506 |
159
|
jones
|
public String toString() {
|
| 507 |
|
|
return "meta_file_id=" + meta_file_id + "\n" +
|
| 508 |
|
|
"querytitle=" + querytitle + "\n" + query;
|
| 509 |
|
|
}
|
| 510 |
|
|
|
| 511 |
158
|
jones
|
/** a utility class that represents a group of terms in a query */
|
| 512 |
|
|
private class QueryGroup {
|
| 513 |
178
|
jones
|
private String operator = null; // indicates how query terms are combined
|
| 514 |
|
|
private Vector children = null; // the list of query terms and groups
|
| 515 |
158
|
jones
|
|
| 516 |
172
|
jones
|
/**
|
| 517 |
|
|
* construct a new QueryGroup
|
| 518 |
|
|
*
|
| 519 |
178
|
jones
|
* @param operator the boolean conector used to connect query terms
|
| 520 |
172
|
jones
|
* in this query group
|
| 521 |
|
|
*/
|
| 522 |
178
|
jones
|
public QueryGroup(String operator) {
|
| 523 |
|
|
this.operator = operator;
|
| 524 |
158
|
jones
|
children = new Vector();
|
| 525 |
|
|
}
|
| 526 |
|
|
|
| 527 |
172
|
jones
|
/**
|
| 528 |
|
|
* Add a child QueryGroup to this QueryGroup
|
| 529 |
|
|
*
|
| 530 |
|
|
* @param qgroup the query group to be added to the list of terms
|
| 531 |
|
|
*/
|
| 532 |
158
|
jones
|
public void addChild(QueryGroup qgroup) {
|
| 533 |
|
|
children.add((Object)qgroup);
|
| 534 |
|
|
}
|
| 535 |
|
|
|
| 536 |
172
|
jones
|
/**
|
| 537 |
|
|
* Add a child QueryTerm to this QueryGroup
|
| 538 |
|
|
*
|
| 539 |
|
|
* @param qterm the query term to be added to the list of terms
|
| 540 |
|
|
*/
|
| 541 |
158
|
jones
|
public void addChild(QueryTerm qterm) {
|
| 542 |
|
|
children.add((Object)qterm);
|
| 543 |
|
|
}
|
| 544 |
|
|
|
| 545 |
172
|
jones
|
/**
|
| 546 |
|
|
* Retrieve an Enumeration of query terms for this QueryGroup
|
| 547 |
|
|
*/
|
| 548 |
158
|
jones
|
public Enumeration getChildren() {
|
| 549 |
|
|
return children.elements();
|
| 550 |
|
|
}
|
| 551 |
159
|
jones
|
|
| 552 |
172
|
jones
|
/**
|
| 553 |
|
|
* create a SQL serialization of the query that this instance represents
|
| 554 |
|
|
*/
|
| 555 |
|
|
public String printSQL() {
|
| 556 |
170
|
jones
|
StringBuffer self = new StringBuffer();
|
| 557 |
|
|
boolean first = true;
|
| 558 |
|
|
|
| 559 |
|
|
self.append("(");
|
| 560 |
|
|
|
| 561 |
|
|
Enumeration en= getChildren();
|
| 562 |
|
|
while (en.hasMoreElements()) {
|
| 563 |
|
|
Object qobject = en.nextElement();
|
| 564 |
|
|
if (first) {
|
| 565 |
|
|
first = false;
|
| 566 |
|
|
} else {
|
| 567 |
178
|
jones
|
self.append(" " + operator + " ");
|
| 568 |
170
|
jones
|
}
|
| 569 |
|
|
if (qobject instanceof QueryGroup) {
|
| 570 |
|
|
QueryGroup qg = (QueryGroup)qobject;
|
| 571 |
172
|
jones
|
self.append(qg.printSQL());
|
| 572 |
170
|
jones
|
} else if (qobject instanceof QueryTerm) {
|
| 573 |
|
|
QueryTerm qt = (QueryTerm)qobject;
|
| 574 |
172
|
jones
|
self.append(qt.printSQL());
|
| 575 |
170
|
jones
|
} else {
|
| 576 |
|
|
System.err.println("qobject wrong type: fatal error");
|
| 577 |
|
|
}
|
| 578 |
|
|
}
|
| 579 |
|
|
self.append(") \n");
|
| 580 |
|
|
return self.toString();
|
| 581 |
|
|
}
|
| 582 |
|
|
|
| 583 |
172
|
jones
|
/**
|
| 584 |
|
|
* create a String description of the query that this instance represents.
|
| 585 |
|
|
* This should become a way to get the XML serialization of the query.
|
| 586 |
|
|
*/
|
| 587 |
159
|
jones
|
public String toString() {
|
| 588 |
|
|
StringBuffer self = new StringBuffer();
|
| 589 |
|
|
|
| 590 |
178
|
jones
|
self.append(" (Query group operator=" + operator + "\n");
|
| 591 |
159
|
jones
|
Enumeration en= getChildren();
|
| 592 |
|
|
while (en.hasMoreElements()) {
|
| 593 |
|
|
Object qobject = en.nextElement();
|
| 594 |
|
|
self.append(qobject);
|
| 595 |
|
|
}
|
| 596 |
|
|
self.append(" )\n");
|
| 597 |
|
|
return self.toString();
|
| 598 |
|
|
}
|
| 599 |
158
|
jones
|
}
|
| 600 |
|
|
|
| 601 |
|
|
/** a utility class that represents a single term in a query */
|
| 602 |
|
|
private class QueryTerm {
|
| 603 |
|
|
private boolean casesensitive = false;
|
| 604 |
|
|
private String searchmode = null;
|
| 605 |
|
|
private String value = null;
|
| 606 |
|
|
private String pathexpr = null;
|
| 607 |
|
|
|
| 608 |
172
|
jones
|
/**
|
| 609 |
|
|
* Construct a new instance of a query term for a free text search
|
| 610 |
|
|
* (using the value only)
|
| 611 |
|
|
*
|
| 612 |
|
|
* @param casesensitive flag indicating whether case is used to match
|
| 613 |
|
|
* @param searchmode determines what kind of substring match is performed
|
| 614 |
|
|
* (one of starts-with|ends-with|contains|matches-exactly)
|
| 615 |
|
|
* @param value the text value to match
|
| 616 |
|
|
*/
|
| 617 |
158
|
jones
|
public QueryTerm(boolean casesensitive, String searchmode,
|
| 618 |
|
|
String value) {
|
| 619 |
|
|
this.casesensitive = casesensitive;
|
| 620 |
|
|
this.searchmode = searchmode;
|
| 621 |
|
|
this.value = value;
|
| 622 |
|
|
}
|
| 623 |
|
|
|
| 624 |
172
|
jones
|
/**
|
| 625 |
|
|
* Construct a new instance of a query term for a structured search
|
| 626 |
|
|
* (matching the value only for those nodes in the pathexpr)
|
| 627 |
|
|
*
|
| 628 |
|
|
* @param casesensitive flag indicating whether case is used to match
|
| 629 |
|
|
* @param searchmode determines what kind of substring match is performed
|
| 630 |
|
|
* (one of starts-with|ends-with|contains|matches-exactly)
|
| 631 |
|
|
* @param value the text value to match
|
| 632 |
|
|
* @param pathexpr the hierarchical path to the nodes to be searched
|
| 633 |
|
|
*/
|
| 634 |
158
|
jones
|
public QueryTerm(boolean casesensitive, String searchmode,
|
| 635 |
|
|
String value, String pathexpr) {
|
| 636 |
|
|
this(casesensitive, searchmode, value);
|
| 637 |
|
|
this.pathexpr = pathexpr;
|
| 638 |
|
|
}
|
| 639 |
|
|
|
| 640 |
172
|
jones
|
/** determine if the QueryTerm is case sensitive */
|
| 641 |
158
|
jones
|
public boolean isCaseSensitive() {
|
| 642 |
|
|
return casesensitive;
|
| 643 |
|
|
}
|
| 644 |
|
|
|
| 645 |
172
|
jones
|
/** get the searchmode parameter */
|
| 646 |
158
|
jones
|
public String getSearchMode() {
|
| 647 |
|
|
return searchmode;
|
| 648 |
|
|
}
|
| 649 |
|
|
|
| 650 |
172
|
jones
|
/** get the Value parameter */
|
| 651 |
158
|
jones
|
public String getValue() {
|
| 652 |
|
|
return value;
|
| 653 |
|
|
}
|
| 654 |
|
|
|
| 655 |
172
|
jones
|
/** get the path expression parameter */
|
| 656 |
158
|
jones
|
public String getPathExpression() {
|
| 657 |
|
|
return pathexpr;
|
| 658 |
|
|
}
|
| 659 |
159
|
jones
|
|
| 660 |
172
|
jones
|
/**
|
| 661 |
|
|
* create a SQL serialization of the query that this instance represents
|
| 662 |
|
|
*/
|
| 663 |
|
|
public String printSQL() {
|
| 664 |
170
|
jones
|
StringBuffer self = new StringBuffer();
|
| 665 |
|
|
|
| 666 |
|
|
// Uppercase the search string if case match is not important
|
| 667 |
|
|
String casevalue = null;
|
| 668 |
|
|
String nodedataterm = null;
|
| 669 |
|
|
|
| 670 |
|
|
if (casesensitive) {
|
| 671 |
|
|
nodedataterm = "nodedata";
|
| 672 |
|
|
casevalue = value;
|
| 673 |
|
|
} else {
|
| 674 |
|
|
nodedataterm = "UPPER(nodedata)";
|
| 675 |
|
|
casevalue = value.toUpperCase();
|
| 676 |
|
|
}
|
| 677 |
|
|
|
| 678 |
|
|
// Add appropriate wildcards to search string
|
| 679 |
|
|
String searchvalue = null;
|
| 680 |
|
|
if (searchmode.equals("starts-with")) {
|
| 681 |
|
|
searchvalue = casevalue + "%";
|
| 682 |
|
|
} else if (searchmode.equals("ends-with")) {
|
| 683 |
|
|
searchvalue = "%" + casevalue;
|
| 684 |
|
|
} else if (searchmode.equals("contains")) {
|
| 685 |
|
|
searchvalue = "%" + casevalue + "%";
|
| 686 |
|
|
} else {
|
| 687 |
|
|
searchvalue = casevalue;
|
| 688 |
|
|
}
|
| 689 |
|
|
|
| 690 |
178
|
jones
|
self.append("SELECT DISTINCT docid FROM xml_nodes WHERE \n");
|
| 691 |
170
|
jones
|
|
| 692 |
|
|
if (pathexpr != null) {
|
| 693 |
|
|
self.append(nodedataterm + " LIKE " + "'" + searchvalue + "' ");
|
| 694 |
|
|
self.append("AND parentnodeid IN ");
|
| 695 |
|
|
self.append("(SELECT nodeid FROM xml_index WHERE path LIKE " +
|
| 696 |
|
|
"'" + pathexpr + "') " );
|
| 697 |
|
|
} else {
|
| 698 |
|
|
self.append(nodedataterm + " LIKE " + "'" + searchvalue + "' ");
|
| 699 |
|
|
}
|
| 700 |
|
|
|
| 701 |
|
|
return self.toString();
|
| 702 |
|
|
}
|
| 703 |
|
|
|
| 704 |
172
|
jones
|
/**
|
| 705 |
|
|
* create a String description of the query that this instance represents.
|
| 706 |
|
|
* This should become a way to get the XML serialization of the query.
|
| 707 |
|
|
*/
|
| 708 |
159
|
jones
|
public String toString() {
|
| 709 |
|
|
|
| 710 |
535
|
jones
|
return this.printSQL();
|
| 711 |
159
|
jones
|
}
|
| 712 |
158
|
jones
|
}
|
| 713 |
155
|
jones
|
}
|